krb5/ss/listen.c

	listen.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * Copyright (c) 2000 by Sun Microsystems, Inc.
 * All rights reserved.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

/*
 * Listener loop for subsystem library libss.a.
 *
 *  util/ss/listen.c
 *
 * Copyright 1987, 1988 by MIT Student Information Processing Board
 *
 * For copyright information, see copyright.h.
 */

#include "copyright.h"
#include "ss_internal.h"
#include <stdio.h>
#include <setjmp.h>
#include <signal.h>
#include <libintl.h>
#include <sys/param.h>
#ifdef BSD
#include <sgtty.h>
#endif

static ss_data *current_info;
static jmp_buf listen_jmpb;

static RETSIGTYPE print_prompt()
{
#ifdef BSD
    /* put input into a reasonable mode */
    struct sgttyb ttyb;
    if (ioctl(fileno(stdin), TIOCGETP, &ttyb) != -1) {
    if (ttyb.sg_flags & (CBREAK|RAW)) {
        ttyb.sg_flags &= ~(CBREAK|RAW);
        (void) ioctl(0, TIOCSETP, &ttyb);
    }
    }
#endif
    (void) fputs(current_info->prompt, stdout);
    (void) fflush(stdout);
}

static RETSIGTYPE listen_int_handler(signo)
    int signo;
{
    putc('\n', stdout);
    longjmp(listen_jmpb, 1);
}

int ss_listen (sci_idx)
    int sci_idx;
{
    register char *cp;
    register ss_data *info;
    char input[BUFSIZ];
    char buffer[BUFSIZ];
    char *end = buffer;
    int code;
    jmp_buf old_jmpb;
    ss_data *old_info = current_info;
#ifdef POSIX_SIGNALS
    struct sigaction isig, csig, nsig, osig;
    sigset_t nmask, omask;
#else
    register RETSIGTYPE (*sig_cont)();
    RETSIGTYPE (*sig_int)(), (*old_sig_cont)();
    int mask;
#endif

    current_info = info = ss_info(sci_idx);
    info->abort = 0;

#ifdef POSIX_SIGNALS
    csig.sa_handler = (RETSIGTYPE (*)())0;
    sigemptyset(&nmask);
    sigaddset(&nmask, SIGINT);
    sigprocmask(SIG_BLOCK, &nmask, &omask);
#else
    sig_cont = (RETSIGTYPE (*)())0;
    mask = sigblock(sigmask(SIGINT));
#endif

    memcpy(old_jmpb, listen_jmpb, sizeof(jmp_buf));

#ifdef POSIX_SIGNALS
    nsig.sa_handler = listen_int_handler;
    sigemptyset(&nsig.sa_mask);
    nsig.sa_flags = 0;
    sigaction(SIGINT, &nsig, &isig);
#else
    sig_int = signal(SIGINT, listen_int_handler);
#endif

    setjmp(listen_jmpb);

#ifdef POSIX_SIGNALS
    sigprocmask(SIG_SETMASK, &omask, (sigset_t *)0);
#else
    (void) sigsetmask(mask);
#endif
    while(!info->abort) {
    print_prompt();
    *end = '\0';
#ifdef POSIX_SIGNALS
    nsig.sa_handler = listen_int_handler;   /* fgets is not signal-safe */
    osig = csig;
    sigaction(SIGCONT, &nsig, &csig);
    if ((RETSIGTYPE (*)())csig.sa_handler==(RETSIGTYPE (*)())listen_int_handler)
        csig = osig;
#else
    old_sig_cont = sig_cont;
    sig_cont = signal(SIGCONT, print_prompt);
    if (sig_cont == print_prompt)
        sig_cont = old_sig_cont;
#endif
    if (fgets(input, BUFSIZ, stdin) != input) {
        code = SS_ET_EOF;
        goto egress;
    }
    cp = strchr(input, '\n');
    if (cp) {
        *cp = '\0';
        if (cp == input)
        continue;
    }
#ifdef POSIX_SIGNALS
    sigaction(SIGCONT, &csig, (struct sigaction *)0);
#else
    (void) signal(SIGCONT, sig_cont);
#endif
    for (end = input; *end; end++)
        ;

    code = ss_execute_line (sci_idx, input);
    if (code == SS_ET_COMMAND_NOT_FOUND) {
        register char *c = input;
        while (*c == ' ' || *c == '\t')
        c++;
        cp = strchr (c, ' ');
        if (cp)
        *cp = '\0';
        cp = strchr (c, '\t');
        if (cp)
        *cp = '\0';
        ss_error (sci_idx, 0, dgettext(TEXT_DOMAIN,
            "Unknown request \"%s\".  Type \"?\" for a request list."),
               c);
    }
    }
    code = 0;
egress:
#ifdef POSIX_SIGNALS
    sigaction(SIGINT, &isig, (struct sigaction *)0);
#else
    (void) signal(SIGINT, sig_int);
#endif
    memcpy(listen_jmpb, old_jmpb, sizeof(jmp_buf));
    current_info = old_info;
    return code;
}

void ss_abort_subsystem(sci_idx, code)
    int sci_idx;
    int code;
{
    ss_info(sci_idx)->abort = 1;
    ss_info(sci_idx)->exit_status = code;

}

void ss_quit(argc, argv, sci_idx, infop)
    int argc;
    char **argv;
    int sci_idx;
    pointer infop;
{
    ss_abort_subsystem(sci_idx, 0);
}